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태권도 활동 참가 동기에 따른 수련 만족도가 자아존중감, 신체적 자기효능감에 미치는 영향
홍이수(Hong Lee-Soo),김성수(Kim Sung-Su) 한국체육과학회 2010 한국체육과학회지 Vol.19 No.4
The purpose of this study is to empirically inquire into the effect of training satisfaction by Taekwondo participation motivation on self-esteem and physical self-efficacy, and understand factors influencing training satisfaction to give valuable information in having more healthy sports activities and school life, and thus furnish basic data for more in-depth understanding of children`s psychology. A survey was made on 313 persons of 11 to 13 year-old elementary school students participating in Taekwondo training at the Taekwondo studio in its jurisdiction located at Incheon and Bucheon. The result of this study is as follows. It showed that for elementary school students' Taekwondo training, the higher intellectual and cognitive motivation, the more training satisfaction is improved, which the improved training satisfaction acts to raise self-esteem and physical self-efficacy. The rise of self-esteem through this was also significant in improving physical self-efficacy. Consequently, for their Taekwondo training, the higher intellectual motivation of knowledge and curiosity about Taekwondo and cognitive motivation of physical improvement and skill acquisition than social motivation of new friends' or friend's recommendation, the more satisfaction with Taekwondo training is improved, serving as a good momentum that improves self-esteem and physical self-efficacy.
Eco-AZ91 MgH₂의 반응열 제어에 미치는 촉매 분산 효과
이수선(SOOSUN LEE),석송(SONG SEOK),홍태환(TAE-WHAN HONG) 한국수소및신에너지학회 2023 한국수소 및 신에너지학회논문집 Vol.34 No.6
This study selected Eco-AZ91 MgH₂, which shows high enthalpy as a material for this purpose, as the basic material, and analyzed the change in characteristics by synthesizing TiNi as a catalyst to control the thermodynamic behavior of MgH₂. In addition, the catalyst dispersion technology using graphene oxide (GO) was studied to improve the high-temperature aggregation phenomenon of Ni catalyst and to secure a source technology that can properly disperse the catalyst. XRD, SEM, and BET analysis were conducted to analyze the metallurgical properties of the material, and TGA and DSC analysis were conducted to analyze the dehydrogenation temperature and calorific value, and the correlation between MgH₂, TiNi catalyst, and GO reforming catalyst was analyzed. As a result, the MgH₂-5 wt% TiNi at GO composite could lower the dehydrogenation temperature to 478-492 K due to the reduction of the catalyst aggregation phenomenon and the increase in the reaction specific surface area, and an experimental result for the catalyst dispersion technology by GO could be ensured.
사용 후 터치스크린 패널의 투명전극용 ITO의 폐기방법별 물질 전과정평가
이수선 ( Soo Sun Lee ),이나리 ( Na Ri Lee ),김경일 ( Kyeong Il Kim ),안중우 ( Joong Woo Ahn ),홍태환 ( Tae Whan Hong ) 한국전과정평가학회 2012 한국전과정평가학회지 Vol.13 No.1
In this research, Material Life Cycle Assessment(MLCA) has been carried out to evaluate the environmental impacts about disposal of ITO(Indium Tin Oxide). ITO is often used for touch and flat screen of phone, PC, computer because of its electrical conductivity and optical transparency which it can be deposited as a thin film. Indium is one of the rare earth and used to ITO material. When demand of the ITO increases, shortage of indium have concerned. This is not only resources insufficient problem it is also environmental problem. Because ITO which did not recycle and landfill or incineration cloud be cause a environmental pollution. According to waste treatment method, disposal about 1kg of ITO was used as the reference flow. There are difficulties for data collection about emissions from waste treatment in LCA. So there is a need to focusing landfill, incineration process for ITO. From this study, it is found out that landfill of ITO has the highest environmental impacts except GWP. But incineration is also high environment impact value by a little gap.
초기청소년이 지각한 부모의 부정적 양육방식, 휴대전화의존도 발달 궤적 및 자기조절학습 간의 관계
홍예지(Yea-ji Hong),이순형(Soon-hyung Yi),이수현(Su Hyun Lee),조혜림(Hye Rhim Cho) 한국아동학회 2015 아동학회지 Vol.36 No.6
The purpose of this study was to examine the relationships among Korean early adolescents’ perceived negative parenting practices, trajectories of mobile phone dependency(MPD), and self-regulated learning(SRL), while taking into account gender differences. Early adolescents are required to acquire self-regulation in Korean cultural contexts of a strong emphasis on academic achievement and recent technological advancements. The study made use of data from the Korean Children and Youth Panel Study(KCYPS), and three waves of data collected from 1,953 adolescents in 7<sup>th</sup>, 8<sup>th</sup> and 9<sup>th</sup> grade were analyzed. The results can be summarized as follows. Growth-curve longitudinal analysis indicates that their initial value of MPD through 7<sup>th</sup> to 9<sup>th</sup> grade had increased, but the initial value and rate of change were significantly different according to gender. Furthermore, the results of multiple group analysis revealed that some path weights appeared different according to gender. For male students, the rate of change in MPD did not have a significant effect on either SRL in 7<sup>th</sup> or 9<sup>th</sup> grade, whereas for female students, it predicted the existence of significant relationships with them. The implications of these findings were also discussed.
철근부식, 겹침이음 및 축하중의 영향을 고려한 원형 전단 교각의 내진성능실험
이수형 ( Soo-hyung Lee ),이승건 ( Seung-geon Lee ),이혜린 ( Hyerin Lee ),홍기증 ( Kee-jeung Hong ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 논문집 Vol.25 No.6
노화된 교각의 횡철근, 주철근, 겹침이음의 철근부식은 교각의 내진성능에 직접적인 영향을 끼친다. 횡철근 및 주철근의 철근부식은 교각의 전단강도 및 휨강도를 각각 직접적으로 감소시킨다. 겹침이음에 철근부식이 생긴다면, 특히 내진설계되지 않은 기존 노후 교각의 휨강도 및 휨연성을 상당히 감소시킨다. 더불어, 교각에 작용하는 축하중이 증가하면 교각의 전단강도가 증가하게 된다. 이러한 영향들을 고려하여, 본 연구에서는 노화를 고려한 합리적인 내진성능평가를 위해, 앞서 언급한 철근부식, 겹침이음, 축하중이 형상비 2이하인 교각의 전단거동과 휨거동에 어떠한 영향을 미치는지 실험을 통해 확인한다. 철근부식으로 인해 전단파괴가 일어날 것으로 예상되는 교각에서 오히려 휨파괴가 발생하는 것을 확인한다. 이러한 파괴모드와 그 원인을 분석하고 내진보강 시 필요한 고려사항을 제시하였다. The corroded pier that has corrosion of the tranverse steel, main steel and lapsplice directly affects the seismic performance. The corrosion of the tranvese and main steel directly reduce the shear strength and bendig strength. If steel corrosion occurs in lap splice, the flexural strength and flexibility of existing corroded pier that are not seismic design are significantly reduced. In addition, as the axial force acting on the pier increase the shear strength. Considering these effects. In this stuydy, we cosidered steel corrosion, lap splice and axial force, for a reasonable evaluation of seismic-performance. It is confirmed that flexular failure occurs at pies where shear failure is expected to occur due to corrosion of reinforcement. These failure modes and their reason are analyzed, and necessary considerations are presented for seismic reinforcement.